Bubble Elephant is a large elephant-shaped bubble character who debuts in the episode "Bubblestand" and is seen again in "Spot Returns".
In "Bubblestand," SpongeBob was showing Patrick bubbles from his technique, he used two hands on his wand to create this elephant bubble. Patrick mistook it for a giraffe. He was laughing until the bubble ends up on Squidward's house. It then popped into a bunch of bubbles, making a loud elephant trumpet. Squidward then confronted SpongeBob and Patrick about the bubble stand.